* update gradle build tools to v1.3.1
* update gradle build tools to v1.3.1

letanloc/Android-Iconics,hejunbinlan/Android-Iconics,mikepenz/Android-Iconics,bestwpw/Android-Iconics,LiuDeng/Android-Iconics,hejunbinlan/Android-Iconics,omegasoft7/Android-Iconics,0359xiaodong/Android-Iconics,mikepenz/Android-Iconics,mikepenz/Android-Iconics,omegasoft7/Android-Iconics,HellPie/Android-Iconics,bestwpw/Android-Iconics,LiuDeng/Android-Iconics,letanloc/Android-Iconics,0359xiaodong/Android-Iconics,mikepenz/Android-Iconics,HellPie/Android-Iconics,LiuDeng/Android-Iconics,bestwpw/Android-Iconics,mikepenz/Android-Iconics,HellPie/Android-Iconics,omegasoft7/Android-Iconics,0359xiaodong/Android-Iconics,hejunbinlan/Android-Iconics,mikepenz/Android-Iconics,letanloc/Android-Iconics